Four-way valve assembly, outdoor unit of heating, ventilation and air conditioning device, and heating, ventilation and air conditioning device

Abstract

A four-way valve assembly (10), an outdoor unit (100) of a heating, ventilation and air conditioning device, and a heating, ventilation and air conditioning device (1000), relating to the technical field of heating, ventilation and air conditioning devices. The four-way valve assembly comprises a main body valve (1), a first connecting pipe (2), a second connecting pipe (3) and a plurality of functional components. The first connecting pipe and the second connecting pipe each comprise at least one stainless steel pipe. The first connecting pipe is connected to the main body valve and an air discharge port of a compressor (20). The second connecting pipe is connected to the main body valve and an air return port of the compressor. At least one functional component is connected to the at least one stainless steel pipe of the first connecting pipe. At least one functional component is connected to the at least one stainless steel pipe of the second connecting pipe. In the present application, integrating and mounting the functional components to the stainless steel pipes of the four-way valve assembly can simplify the structure of the outdoor unit of the heating, ventilation and air conditioning device and reduce the production and manufacturing costs, and the stainless steel pipes can provide the functional components with better mounting stability and vibration resistance.

Description

Four-way valve assembly, air conditioning outdoor unit and air conditioning

[0001] Cross-reference to Related Applications

[0002] This application claims priority to and the benefit of the following patents, which are incorporated by reference in their entirety into this application:

[0003] Chinese Patent Application No. 202432362090.0, filed on September 26, 2024, entitled “Four-way valve assembly, air conditioning outdoor unit and air conditioning”, and

[0004] Chinese Patent Application No. 202432366546.0, filed on September 26, 2024, entitled “Four-way valve, air conditioning outdoor unit and air conditioning”, and

[0005] Chinese Patent Application No. 202411358528.6, filed on September 26, 2024, entitled “Four-way valve assembly, air conditioning outdoor unit and air conditioning”, and

[0006] Chinese Patent Application No. 202432366676.4, filed on September 26, 2024, entitled “Four-way valve assembly, air conditioning outdoor unit and air conditioning”, and

[0007] Chinese Patent Application No. 202432366483.9, filed on September 26, 2024, entitled “Four-way valve assembly, air conditioning outdoor unit and air conditioning”, and

[0008] Chinese Patent Application No. 202432366519.3, filed on September 26, 2024, entitled “Four-way valve assembly, air conditioning outdoor unit and air conditioning”, and

[0009] Chinese Patent Application No. 202510901570.6, filed on June 30, 2025, entitled “Four-way valve assembly, air conditioning outdoor unit and air conditioning”. TECHNICAL FIELD

[0010] The present application relates to the technical field of air conditioning equipment, and in particular to a four-way valve assembly, an air conditioning outdoor unit and an air conditioning. BACKGROUND

[0011] The background information provided in this section is only for the purpose of enhancing the understanding of the present disclosure, and does not necessarily constitute prior art.

[0012] The four-way valve plays a key control and regulation role in air conditioning equipment, ensuring that the system can operate efficiently and stably, while meeting the requirements of different use environments and needs.

[0013] The four-way valve needs to be connected with functional components such as sensors, pressure switches and filters to ensure the stable operation of the HVAC equipment. In the related art, the functional components are independently distributed in the body of the outdoor unit of the HVAC equipment and are connected with the four-way valve through complex pipelines, so that the body structure is complex, bulky and high in production cost. SUMMARY

[0014] The purpose of the present application is to at least solve the problem that the cleaning disc of the existing cleaning system is not easy to clean after cleaning. The purpose is achieved by the following technical solutions:

[0015] In a first aspect, the present application provides a four-way valve assembly applied to an HVAC equipment with a compressor, comprising a main valve, a first pipe joint, a second pipe joint and a plurality of functional components, the first pipe joint comprising at least one stainless steel pipe, one end of the first pipe joint being connected and communicated with the main valve, and the other end being connected with an exhaust port of the compressor; the second pipe joint comprising at least one stainless steel pipe, one end of the second pipe joint being connected and communicated with the main valve, and the other end being connected with a gas return port of the compressor; the functional components being valve bodies, sensors or pressure switches, at least one of the functional components being connected on at least one of the stainless steel pipes of the first pipe joint, and at least one of the functional components being connected on at least one of the stainless steel pipes of the second pipe joint.

[0016] According to the four-way valve assembly provided by the present application, the first pipe joint and the second pipe joint of the HVAC equipment are designed to comprise one or more stainless steel pipes, and the functional components are integrated and installed on the stainless steel pipes. Compared with the way of integrating the functional components on the pipelines other than the four-way valve assembly in the related art, the structure of the outdoor unit of the HVAC equipment can be simplified to some extent, the overall volume of the body can be reduced, and the production manufacturing cost can be reduced to some extent. In addition, the functional components are integrated and installed on the stainless steel pipes, which can provide better installation stability and anti-vibration performance for the functional components.

[0017] In addition, the four-way valve assembly provided by the present application can have the following additional technical features:

[0018] In some embodiments of the present application, the four-way valve assembly further comprises a first branch pipe, the first pipe joint comprises a first stainless steel pipe, the first stainless steel pipe is provided with a first opening, one connecting port of the first branch pipe is connected with the first opening, and the other connecting port of the first branch pipe is connected and communicated with one of the functional components.

[0019] In some embodiments of the present application, the functional component connected and communicated with the first branch pipe is a first pressure sensor, and the first pressure sensor is used to detect the refrigerant pressure of the first pipe joint.

[0020] In some embodiments of the application, the first branch pipe is made of stainless steel, an interface of the first branch pipe connected with the first pressure sensor is provided with a first copper adapter, and the first pressure sensor is provided with a first copper connecting pipe which is welded with the first copper adapter.

[0021] In some embodiments of the application, the first pipe joint further comprises a second stainless steel pipe, one end of the second stainless steel pipe is connected with and communicates with the main valve, and the other end of the second stainless steel pipe is sleeved with one end of the first stainless steel pipe, and the other end of the first stainless steel pipe is used for communicating with the exhaust port.

[0022] In some embodiments of the application, the four-way valve assembly further comprises a second branch pipe, the second pipe joint comprises a third stainless steel pipe provided with a second opening, one connecting port of the second branch pipe is connected with the second opening, and the other connecting port of the second branch pipe is connected with and communicates with one of the functional components.

[0023] In some embodiments of the application, the four-way valve assembly further comprises a bypass pipeline, the functional component connected and communicated with the first branch pipe is a first pressure sensor, the first pressure sensor is used for detecting the refrigerant pressure of the first pipe joint, and the functional component connected and communicated with the second branch pipe is a first valve body, the first valve body is connected with the first branch pipe in communication through the bypass pipeline.

[0024] In some embodiments of the application, the first valve body is configured to be opened when the first pressure sensor detects that the refrigerant pressure of the first pipe joint exceeds a first threshold value, so that the refrigerant in the first pipe joint flows into the second pipe joint.

[0025] In some embodiments of the application, the bypass pipeline comprises a throttling device.

[0026] In some embodiments of the application, the throttling device is a throttle valve, the throttle valve comprises a main pipe portion and a valve core arranged in the main pipe portion, one port of the main pipe portion is connected with the first branch pipe, the other port of the main pipe portion is connected with the second branch pipe, and the valve core is used for controlling the refrigerant flow passing through the main pipe portion.

[0027] In some embodiments of the present application, the throttling device is a capillary assembly, which comprises a capillary tube and two connecting sleeves respectively arranged at two ends of the capillary tube, the connecting sleeves have a larger diameter than the capillary tube, one of the connecting sleeves is used to connect the first branch pipe, and the other of the connecting sleeves is used to connect the second branch pipe.

[0028] In some embodiments of the present application, the capillary tube is made of copper or copper alloy or stainless steel, the connecting sleeves are made of copper, the first branch pipe is provided with a second copper adapter, the second branch pipe is provided with a third copper adapter, the second copper adapter is connected with one of the connecting sleeves, and the third copper adapter is connected with the other of the connecting sleeves.

[0029] In some embodiments of the present application, the four-way valve assembly further comprises a third branch pipe, the first stainless steel pipe is provided with a third opening, one connecting port of the third branch pipe is connected with the third opening, and the other connecting port of the third branch pipe is connected with and communicates with a functional component, the functional component connected with the third branch pipe is a second valve body, and the second valve body is used to communicate with a defrosting pipe of the heating and ventilation equipment.

[0030] In some embodiments of the present application, the third branch pipe is a copper pipe, the second valve body is provided with a second copper connecting pipe, and the third branch pipe is welded with the second copper connecting pipe.

[0031] In some embodiments of the present application, the first branch pipe and the second branch pipe are made of stainless steel, and / or the bypass pipe is made of stainless steel or copper.

[0032] In some embodiments of the present application, the four-way valve assembly further comprises a fourth branch pipe, the third stainless steel pipe is provided with a fourth opening, one connecting port of the fourth branch pipe is connected with the fourth opening, and the other connecting port of the fourth branch pipe is connected with and communicates with a functional component, the functional component connected with and communicated with the fourth branch pipe is a second pressure sensor, and the second pressure sensor is used to detect the refrigerant pressure of the second pipe joint.

[0033] In some embodiments of the present application, the four-way valve assembly further comprises a fifth branch pipe, the third stainless steel pipe is provided with a fifth opening, one connecting port of the fifth branch pipe is connected with the fifth opening, and the other connecting port of the fifth branch pipe is connected with and communicates with a functional component, the functional component connected with and communicated with the fifth branch pipe is a third valve body, and the third valve body is used to communicate with a refrigerant passage of the heating and ventilation equipment, in which the pressure is greater than that of the second pipe joint.

[0034] In some embodiments of the present application, the second pipe joint comprises a fourth stainless steel pipe, one end of the fourth stainless steel pipe is connected to and communicates with the main valve, and the other end of the fourth stainless steel pipe is sleeved with one end of the third stainless steel pipe, and the other end of the third stainless steel pipe is used to communicate with the gas return port.

[0035] In some embodiments of the present application, the four-way valve assembly comprises a third pipe joint, the third pipe joint comprises a fifth stainless steel pipe and a sixth stainless steel pipe, one end of the fifth stainless steel pipe is connected to and communicates with the main valve, and the other end of the fifth stainless steel pipe is sleeved with one end of the sixth stainless steel pipe, and the other end of the sixth stainless steel pipe is used to communicate with the heat source heat exchanger of the heating and ventilation equipment.

[0036] In some embodiments of the present application, the four-way valve assembly comprises a fourth pipe joint, the fourth pipe joint comprises a seventh stainless steel pipe and an eighth stainless steel pipe, one end of the seventh stainless steel pipe is connected to and communicates with the main valve, and the other end of the eighth stainless steel pipe is sleeved with one end of the seventh stainless steel pipe, and the other end of the eighth stainless steel pipe is used to communicate with the load heat exchanger of the heating and ventilation equipment.

[0037] In some embodiments of the present application, the eighth stainless steel pipe is provided with a plurality of curved sections, the axis of the main valve, the axis of the seventh stainless steel pipe and the axis of the eighth stainless steel pipe at any position are located in the same plane.

[0038] In some embodiments of the present application, the functional component is provided with a connecting pipe, the stainless steel pipe and the connecting pipe are connected through a branch pipe; the connecting pipe and the branch pipe are made of stainless steel material, the connecting pipe and the branch pipe are directly welded; or the material of the connecting pipe is copper material, the material of the branch pipe is stainless steel material, and the branch pipe is connected with the connecting pipe through a copper adapter.

[0039] In some embodiments of the present application, the branch pipe is connected with the connecting pipe through a copper adapter, the copper adapter is a copper plating layer laid on the end of the branch pipe, or the copper adapter is a copper adapter connected between the branch pipe and the connecting pipe.

[0040] In some embodiments of the present application, the plurality of functional components comprises a one-way valve, the first pipe joint is provided with the one-way valve at one end away from the main valve, the one-way valve is configured to switch between an open state and a closed state, the one-way valve is in communication with the first pipe joint and the exhaust port when the one-way valve is in the open state, and the one-way valve cuts off the communication between the first pipe joint and the exhaust port when the one-way valve is in the closed state.

[0041] In some embodiments of the present application, the one-way valve comprises a valve pipe and a valve core connected in the valve pipe, one end of the valve pipe is installed on the first pipe joint, and the valve pipe and the first pipe joint are integrally connected or integrally formed.

[0042] In some embodiments of the present application, the plurality of functional components comprises a first pressure sensor, the first pressure sensor is installed on the first pipe joint and in communication with the first pipe joint, and the first pressure sensor is configured to detect pressure information in the first pipe joint.

[0043] In some embodiments of the present application, the functional components further comprise a second pressure sensor, the second pipe joint is configured to communicate with an air inlet pipe, the air inlet pipe is configured to communicate with a gas return port of the compressor, the second pressure sensor is installed on the second pipe joint and in communication with the second pipe joint, and the second pressure sensor is configured to detect pressure information in the second pipe joint.

[0044] In some embodiments of the present application, the first pressure sensor is integrally connected with the first pipe joint; and / or, the second pressure sensor is integrally connected with the second pipe joint.

[0045] In some embodiments of the present application, the first pressure sensor is further connected and in communication with the second pipe joint, and the first pressure sensor is configured to detect pressure information of the first pipe joint and pressure information of the second pipe joint.

[0046] In some embodiments of the present application, the first pressure sensor comprises a pressure detection mechanism, a first conducting member and a second conducting member, one end of the first conducting member is connected and in communication with the pressure detection mechanism, the other end of the first conducting member is connected and in communication with the first pipe joint, one end of the second conducting member is connected and in communication with the pressure detection mechanism, and the other end of the second conducting member is connected and in communication with the second pipe joint, the pressure detection mechanism is configured to detect pressure information in the first pipe joint through the first conducting member and to detect pressure information in the second pipe joint through the second conducting member.

[0047] In some embodiments of the present application, the first conducting member is integrally connected to the first pipe joint; and / or, the second conducting member is integrally connected to the second pipe joint.

[0048] In some embodiments of the present application, the second conducting member is provided with a bending portion, which is arranged to face the main valve, the first pipe joint and the second pipe joint, and enclose an installation space with the main valve, the first pipe joint and the second pipe joint.

[0049] In some embodiments of the present application, the four-way valve assembly further comprises a pilot valve, which is installed in the main valve and partially located in the installation space.

[0050] In some embodiments of the present application, the first pipe joint is provided with a first connecting interface, and the first pressure sensor is at least partially installed in the first connecting interface and connected to the first pipe joint through the first connecting interface; and / or, the second pipe joint is provided with a second connecting interface, and the second pressure sensor is at least partially installed in the second connecting interface and connected to the second pipe joint through the second connecting interface.

[0051] In some embodiments of the present application, the four-way valve assembly further comprises a second filter, and the four-way valve body further comprises a third pipe joint arranged on the main valve, which is used to connect a first refrigerant flow path, and the first refrigerant flow path is used to connect a heat exchanger of the heating and ventilation equipment, and the second filter is connected to the third pipe joint and used to filter refrigerant flowing through the third pipe joint.

[0052] In some embodiments of the present application, the third pipe joint is provided with an air outlet, and the second filter comprises a filter cartridge and a first filter member located in the filter cartridge, one end of the filter cartridge is installed in the air outlet and connected to the third pipe joint through the air outlet.

[0053] In some embodiments of the present application, in a direction away from the third pipe joint, the filter cartridge comprises a first reducing section and an expanding section connected in sequence, the first reducing section is connected to the third pipe joint, and the inner diameter of the first reducing section gradually increases from one end close to the third pipe joint to the other end away from the third pipe joint, and the inner diameter of the expanding section is greater than that of the third pipe joint.

[0054] In some embodiments of the present application, the second filter comprises a second filter member, which is installed in the third pipe joint.

[0055] In some embodiments of the present application, the plurality of functional components comprises a first pressure switch, the first pressure switch is installed on the first pipe joint and in communication with the first pipe joint; and / or the plurality of functional components comprises a second pressure switch, the second pressure switch is installed on the second pipe joint and in communication with the second pipe joint.

[0056] In some embodiments of the present application, the first pipe joint is provided with a third connecting interface, the first pressure switch is installed on the third connecting interface and in communication with the first pipe joint through the third connecting interface; and / or the first pipe joint is provided with a fourth connecting interface, the second pressure switch is installed on the fourth connecting interface and in communication with the first pipe joint through the fourth connecting interface.

[0057] In some embodiments of the present application, the functional components comprises a first temperature sensor, the first temperature sensor is installed on the first pipe joint and used for detecting the temperature in the first pipe joint; and / or the four-way valve assembly further comprises a second temperature sensor, the second temperature sensor is installed on the second pipe joint and used for detecting the temperature in the second pipe joint.

[0058] In some embodiments of the present application, the first pipe joint is provided with a fifth connecting interface, the first temperature sensor is installed on the fifth connecting interface and in communication with the first pipe joint through the fifth connecting interface; and / or the first pipe joint is provided with a sixth connecting interface, the second temperature sensor is installed on the sixth connecting interface and in communication with the first pipe joint through the sixth connecting interface.

[0059] In some embodiments of the present application, the first temperature sensor comprises a first heat conduction member and a first temperature detection member, the first heat conduction member is installed on the first pipe joint and in thermal conduction connection with the first pipe joint, the first heat conduction member is provided with a first accommodating cavity, the first temperature detection member is installed in the first accommodating cavity and in abutment with the inner wall of the first heat conduction member.

[0060] In some embodiments of the present application, one end of the first heat conduction member is provided with a first opening, the first opening is in communication with the first accommodating cavity, and the first temperature detection member is inserted into the first accommodating cavity through the first opening.

[0061] In some embodiments of the present application, the four-way valve assembly further comprises an adapter device, the adapter device is installed on the main valve and used for electrically connecting the functional components and the main control board of the heating and ventilation equipment.

[0062] In some embodiments of the present application, the adapter device comprises a mounting seat and a middle plate, the mounting seat is mounted on the main valve, the mounting seat is provided with a receiving groove, and the middle plate is mounted in the mounting seat and used to connect the main control plate and the functional component.

[0063] In some embodiments of the present application, the adapter device further comprises a cover, the cover covers the mounting seat and forms a cavity with the receiving groove for mounting the middle plate.

[0064] In a second aspect, the present application provides an outdoor unit of a heating and ventilation device, comprising a shell, a heat exchanger, a compressor and the four-way valve assembly according to any one of the above technical solutions; the heat exchanger, the compressor and the four-way valve assembly are all arranged in the shell, the main valve of the four-way valve assembly is communicated between the compressor and the heat exchanger, the first pipe joint of the four-way valve assembly is communicated with the exhaust port of the compressor, and the second pipe joint of the four-way valve assembly is communicated with the gas return port of the compressor.

[0065] In a third aspect, the present application provides a heating and ventilation device, comprising an indoor unit of a heating and ventilation device and the outdoor unit of a heating and ventilation device according to the above, and the indoor unit of a heating and ventilation device and the outdoor unit of a heating and ventilation device are connected through a pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0066] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numerals in the various drawings indicate the same or similar elements. In the drawings:

[0067] FIG. 1 is a structural schematic diagram of a four-way valve assembly according to Embodiment One of the present application;

[0068] FIG. 2 is a partial structural schematic diagram of the four-way valve assembly shown in FIG. 1 from a first perspective;

[0069] FIG. 3 is a partial structural schematic diagram of the four-way valve assembly shown in FIG. 1 from a second perspective;

[0070] FIG. 4 is an exploded schematic diagram of the four-way valve assembly shown in FIG. 4;

[0071] FIG. 5 is a structural schematic diagram of a four-way valve assembly and a three-way valve according to Embodiment One of the present application;

[0072] FIG. 6 is a structural schematic diagram of another four-way valve assembly according to Embodiment One of the present application;

[0073] FIG. 7 is a refrigerant flow chart of a refrigerant circulation loop according to Embodiment One of the present application in a refrigeration mode;

[0074] Fig. 8 is a refrigerant flow chart of the refrigerant cycle circuit according to Embodiment 1 of the present application in a heating mode;

[0075] Fig. 9 is a structural view of a first four-way valve assembly according to Embodiment 2 of the present application;

[0076] Fig. 10 is a structural view of a second four-way valve assembly according to Embodiment 2 of the present application;

[0077] Fig. 11 is a structural view of a third four-way valve assembly according to Embodiment 2 of the present application;

[0078] Fig. 12 is a structural view of a fourth four-way valve assembly according to Embodiment 2 of the present application;

[0079] Fig. 13 is a structural view of a first filter member according to Embodiment 2 of the present application;

[0080] Fig. 14 is an enlarged view of a portion a of Fig. 5;

[0081] Fig. 15 is a structural view of a second filter member according to Embodiment 2 of the present application;

[0082] Fig. 16 is an enlarged view of a portion b of Fig. 7;

[0083] Fig. 17 is a structural view of a third filter member according to Embodiment 2 of the present application;

[0084] Fig. 18 is a refrigerant flow chart of a heating and cooling apparatus according to Embodiment 2 of the present application;

[0085] Fig. 19 is a structural view of a first four-way valve assembly according to Embodiment 3 of the present application;

[0086] Fig. 20 is a structural view of a second four-way valve assembly according to Embodiment 3 of the present application;

[0087] Fig. 21 is a structural view of a third four-way valve assembly according to Embodiment 3 of the present application;

[0088] Fig. 22 is a structural view of a first temperature sensor according to Embodiment 3 of the present application;

[0089] Fig. 23 is a structural view of a fourth four-way valve assembly according to Embodiment 3 of the present application;

[0090] Fig. 24 is a structural view of a fifth four-way valve assembly according to Embodiment 3 of the present application from one perspective;

[0091] Fig. 25 is a structural view of a fifth four-way valve assembly according to Embodiment 3 of the present application from another perspective;

[0092] Fig. 26 is a structural schematic diagram of an adapter device provided in Embodiment Three of the present application.

[0093] The reference signs are as follows: 1000, heating and ventilation equipment; 100, outdoor unit of the heating and ventilation equipment; 200, indoor unit of the heating and ventilation equipment; 300, first refrigerant flow path; 3001, liquid-side stop valve; 3002, expansion valve; 400, second refrigerant flow path; 500, subcooling device; 501, main cooling path; 502, auxiliary cooling path; 600, oil separation assembly; 601, oil separation tank; 602, oil separation gas pipe; 603, oil separation gas pipe; 700, oil return capillary tube; 800, gas-liquid separator; 900, injection return path; 10, four-way valve assembly; 1, main valve; 101, pilot valve; 2, first pipe joint; 21, first stainless steel pipe; 211, first copper connecting part; 22, second stainless steel pipe; 23, first branch pipe; 231, first copper adapter; 24, first pressure sensor; 241, first copper connecting pipe; 242, first lead-through part; 243, second lead-through part; 2431, bent part; 2432, mounting space; 25, third branch pipe; 26, second valve body; 261, second copper connecting pipe; 27, one-way valve; 28, first pressure switch; 29, first temperature sensor; 291, first heat-conducting part; 292, first temperature detecting part; 2911, first opening; 3, second pipe joint; 31, third stainless steel pipe; 311, second copper connecting part; 32, fourth stainless steel pipe; 33, second branch pipe; 34, first valve body; 35, fourth branch pipe; 36, second pressure sensor; 37, fifth branch pipe; 38, third valve body; 39, second pressure switch; 310, second temperature sensor; 4, third pipe joint; 41, fifth stainless steel pipe; 42, sixth stainless steel pipe; 421, third copper connecting part; 43, second filter; 431, filter cartridge; 4311, first reducing section; 4312, expanding section; 4313, second reducing section; 432, first filtering part; 433, second filtering part; 5, fourth pipe joint; 51, seventh stainless steel pipe; 52, eighth stainless steel pipe; 521, fourth copper connecting part; 53, first filter; 54, gas-side stop valve; 55, third temperature sensor; 6, bypass pipe; 61, throttling device; 611, main pipe part; 612, first transition part; 613, capillary tube part; 614, connecting sleeve; 62, pipe body; 7, three-way valve; 71, first interface; 72, second interface; 73, third interface; 74, second copper connecting part; 8, mounting part; 81, connecting hole; 82, raised part; 9, adapter device; 91, middle collecting plate; 92, mounting seat; 921, first wire passing hole; 922, second wire passing hole; 93, cover body; 20, compressor; 201, compressor exhaust pipe; 202, compressor return gas pipe; 30, heat source heat exchanger; 301, defrosting pipe; 40, load heat exchanger. Detailed Implementation

[0094] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0095] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0096] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0097] For the purposes of the description, relative terms such as "inner", "outer", "inwardly", "outwardly", "lower", "bottom", "top", "upper", and the like can be used herein for describing purposes only with respect to a particular view or orientation in a drawing figure. Such relative terms can include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the examples "below" and "beneath" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0098] Embodiment one

[0099] With reference to the drawings 1-5, the embodiment of the present application provides a four-way valve assembly 10 applied to a heating and ventilation device 1000 with a compressor 20, the four-way valve assembly 10 includes a four-way valve body and a plurality of functional components, the four-way valve body includes a main valve 1, a first pipe joint 2, a second pipe joint 3, a third pipe joint 4 and a fourth pipe joint 5, the first pipe joint 2, the second pipe joint 3, the third pipe joint 4 and the fourth pipe joint 5 are connected to the main valve 1 by mechanical connection methods such as welding, insertion and the like.

[0100] It should be noted that the structure with hatched filling in the drawing 2 of the embodiment is made of copper material.

[0101] Differing from the related art, the first pipe joint 2 of the embodiment is located at the lower side of the main valve 1, the second pipe joint 3, the third pipe joint 4 and the fourth pipe joint 5 are located at the upper side of the main valve 1, forming an inverted four-way valve assembly 10, in this way, the interface of the first pipe joint 2 can be directly connected to the refrigerant pipeline below to communicate with the exhaust port of the compressor 20, simplifying the pipeline arrangement, facilitating the assembly and maintenance of the device, and shortening the exhaust path between the compressor 20 and the four-way valve, improving the smoothness of the refrigerant flow, and improving the efficiency of the heating and ventilation device 1000.

[0102] Among them, one end of the first pipe joint 2 is connected and communicated with the main valve 1 through the above-mentioned mechanical connection method, the other end of the first pipe joint 2 is communicated with the exhaust port of the compressor 20 through the second refrigerant discharge flow path 400 of the compressor 20, the refrigerant flowing out of the exhaust port of the compressor 20 enters the cavity of the main valve 1 in sequence through the second refrigerant discharge flow path 400 and the first pipe joint 2.

[0103] The second pipe joint 3 is used for connecting the return gas port of the compressor 20, and the second pipe joint 3 and the first pipe joint 2 can be located on two sides of the main valve 1 in the radial direction, respectively, and the refrigerant in the four-way valve assembly 10 can flow back to the compressor 20 in sequence through the second pipe joint 3 and the S pipe.

[0104] The third pipe joint 4 is connected with the heat source heat exchanger 30, and the fourth pipe joint 5 is connected with the load heat exchanger 40, so that the refrigerant can flow between the heat source heat exchanger 30 and the load heat exchanger 40 of the heating and ventilation equipment 1000, the refrigerant in the heat source heat exchanger 30 exchanges heat with the external heat source, and the load heat exchanger is arranged in the target regulated space and is used for exchanging heat with the temperature of the target regulated space. Generally, the heat source heat exchanger is arranged outdoors, and the target regulated space is an indoor space.

[0105] Different from the copper pipe structure in the related art, the first pipe joint 2 and the second pipe joint 3 are designed to each include at least one stainless steel pipe, that is, the first pipe joint 2 and the second pipe joint 3 can each be composed of one stainless steel pipe, or can each be formed by a plurality of stainless steel pipes connected in sequence, when the first pipe joint 2 and the second pipe joint 3 each include a plurality of stainless steel pipes, the adjacent two stainless steel pipes can be sleeved, or can be directly welded, or can be connected through two copper adapters.

[0106] Taking the first pipe joint 2 in the figure as an example, the first pipe joint 2 includes a first stainless steel pipe 21 and a second stainless steel pipe 22, one end of the second stainless steel pipe 22 is connected and communicated with the main valve 1 through a mechanical connection mode such as sleeving, inserting or welding, and the other end of the second stainless steel pipe 22 can be sleeved with one end of the first stainless steel pipe 21. Alternatively, one end of the second stainless steel pipe 22 away from the main valve 1 is connected with a copper adapter, and one end of the first stainless steel pipe 21 facing the main valve 1 is connected with a copper adapter, and the two copper adapters are connected through a detachable connection mode such as inserting or sleeving (this kind of implementation is not shown in the figure). The above two connection modes of the first stainless steel pipe 21 and the second stainless steel pipe 22 can realize convenient disassembly and assembly of the first stainless steel pipe 21 and the second stainless steel pipe 22.

[0107] Similarly, the second pipe joint 3 includes a third stainless steel pipe 31 and a fourth stainless steel pipe 32, one end of the fourth stainless steel pipe 32 is connected and communicated with the main valve 1 through a mechanical connection mode such as inserting or welding, and the other end of the fourth stainless steel pipe 32 can be sleeved with the first stainless steel pipe 21 or connected through two copper adapters (this kind of implementation is not shown in the figure).

[0108] The third pipe joint 4 comprises a fifth stainless steel pipe 41 and a sixth stainless steel pipe 42. One end of the fifth stainless steel pipe 41 is connected and communicated with the main valve 1 through mechanical connection modes such as insertion and welding. The other end of the fifth stainless steel pipe 41 is sleeved with one end of the sixth stainless steel pipe 42. The other end of the sixth stainless steel pipe 42 is used for communicating with the heat source heat exchanger 30 of the HVAC equipment 1000. The sixth stainless steel pipe 42 is a curved pipe and has a plurality of curved sections.

[0109] The fourth pipe joint 5 comprises a seventh stainless steel pipe 51 and an eighth stainless steel pipe 52. One end of the seventh stainless steel pipe 51 is connected and communicated with the main valve 1 through mechanical connection modes such as insertion and welding. The other end of the seventh stainless steel pipe 51 is sleeved with one end of the eighth stainless steel pipe 52. The other end of the eighth stainless steel pipe 52 is used for communicating with the load heat exchanger 40 of the HVAC equipment 1000. The eighth stainless steel pipe 52 is a curved pipe and has a plurality of curved sections. In some embodiments, the first filter 53, the third temperature sensor 55, and the gas side stop valve 54 are integrally installed on the eighth stainless steel pipe 52.

[0110] The four-way valve assembly 10 with the above structure can be designed as a straight pipe structure for the second stainless steel pipe 22, the fourth stainless steel pipe 32, the fifth stainless steel pipe 41, and the seventh stainless steel pipe 51. In the production process, the main valve body, the fourth stainless steel pipe 32, the fifth stainless steel pipe 41, and the seventh stainless steel pipe 51 are produced as standard parts. Then, the first stainless steel pipe 21, the third stainless steel pipe 31, the sixth stainless steel pipe 42, and the eighth stainless steel pipe 52 are assembled respectively. Compared with the direct integrated production and processing of the main valve 1, the first pipe joint 2, the second pipe joint 3, the third pipe joint 4, and the fourth pipe joint 5, the first pipe joint 2, the second pipe joint 3, the third pipe joint 4, and the fourth pipe joint 5 are designed as separate structures in this embodiment. This structure is more conducive to production and processing and reduces production costs.

[0111] In addition, the first pipe joint 2 and the second pipe joint 3 of the HVAC equipment 1000 are designed to comprise one or more stainless steel pipes in the above structure. The functional components are integrally installed on the stainless steel pipes. Compared with the related art in which the functional components are integrated on the pipelines other than the four-way valve assembly 10, the structure of the outdoor unit of the HVAC equipment 1000 can be simplified to a certain extent, the overall size of the machine body can be reduced, and the production cost can be reduced to a certain extent. Moreover, the functional components are integrally installed on the stainless steel pipes, which can provide better installation stability and anti-vibration performance for the functional components.

[0112] In order to facilitate the installation of the functional components, the four-way valve assembly 10 is designed to have a plurality of branch pipes in this embodiment. The plurality of branch pipes comprise the first branch pipe 23, the second branch pipe 33, the third branch pipe 25, the fourth branch pipe 35, and the fifth branch pipe 37, etc.

[0113] In combination with FIG. 4 and FIG. 5, the four-way valve assembly 10 of the present embodiment includes a first branch pipe 23, and accordingly, a first opening (not labeled in the figure) is formed on the first stainless steel pipe 21, one connection port of the first branch pipe 23 is connected to the first opening by a fixed connection mode such as welding, and the other connection port of the first branch pipe 23 is connected to and communicates with a first pressure sensor 24, which is used to detect the refrigerant pressure of the first pipe joint 2.

[0114] In some examples, optionally, the first branch pipe 23 of the present embodiment is made of stainless steel, and the connection port of the first branch pipe 23 connected to the first pressure sensor 24 is provided with a first copper adapter 231, which is made of copper or copper alloy, and the materials of the second copper adapter and the third copper adapter described below are also the same.

[0115] Correspondingly, the first pressure sensor 24 of the present embodiment is provided with a first copper connecting pipe 241, which is welded with the first copper adapter 231.

[0116] The first copper adapter 231 can be a copper sleeve installed at the interface of the first branch pipe 23, or a copper plating layer on the first branch pipe 23. Compared with the welding method of stainless steel and copper material, or compared with the welding method of stainless steel and stainless steel, the "copper-copper connection" of the first copper adapter 231 and the first copper connecting pipe 241 avoids the problem of galvanic corrosion between dissimilar metals, improves long-term stability, and is especially suitable for humid or corrosive environments. The welding process of copper-copper connection is simpler and more reliable, does not require special solder or transition layer, is not prone to cracks due to thermal expansion, and is convenient for installation and maintenance.

[0117] In combination with FIG. 1-5 again, in some examples, optionally, the four-way valve assembly 10 further includes a second branch pipe 33, and accordingly, the third stainless steel pipe 31 of the present embodiment is provided with a second opening (not shown in the figure), one connection port of the second branch pipe 33 is connected to the third opening, and the other connection port of the second branch pipe 33 is connected to and communicates with a first valve body 34, which can be a valve body structure such as a solenoid valve capable of opening and closing the second branch pipe 33.

[0118] Further, the bypass pipe 6 is connected with the first branch pipe 23 and the second branch pipe 33, and the bypass pipe 6 is connected with the first branch pipe 23 and the second branch pipe 33, respectively. The first branch pipe 23 is configured as a tee joint having three connection ports. The first connection port is inserted into the first opening. The second connection port is connected with the first copper adapter 231, and the first pressure sensor 24 is communicated with the first pipe joint 2 via the first copper adapter 231. The third connection port is communicated with the bypass pipe 6. The second branch pipe is communicated with the bypass pipe 6 via the first valve body 34. The first branch pipe 23, the second branch pipe 33, the bypass pipe 6, the first pressure sensor 24, and the first valve body 34 form a bypass structure. When the first pressure sensor 24 of the bypass structure detects that the refrigerant pressure of the first pipe joint 2 exceeds the first threshold value, the electronic control assembly (not shown in the figure) controls the first valve body 34 to be opened, so that a part of the refrigerant in the first pipe joint 2 flows into the second pipe joint 3, thereby reducing the possibility of excessive refrigerant pressure in the first pipe joint 2 by discharging the refrigerant in the first pipe joint 2 to the second pipe joint 3 through the first branch pipe 23, the second branch pipe 33, and the bypass pipe 6.

[0119] In addition, by integrating the first pressure sensor 24 and the first valve body 34 in the first branch pipe 23 and the second branch pipe 33, respectively, and forming a bypass structure with the bypass pipe 6, the layout structure is compact, so that the pressure relief function and the pressure detection function are integrated, and no additional holes need to be opened on the first pipe joint 2 or the second pipe joint 3, thereby reducing the pipe processing procedure, and reducing the processing difficulty and cost.

[0120] Further, the bypass pipe 6 of the embodiment includes a throttling device 61 and a pipe body 62. One end of the throttling device 61 is connected with one end of the pipe body 62, and the other end is connected with the first branch pipe 23. The other end of the pipe body 62 is connected with the first valve body 34. The throttling device 61 is used to reduce the flow in the bypass pipe 6 to a preset value, thereby preventing the large flow of refrigerant from entering the second pipe joint 3 when the first pipe joint 2 is discharged.

[0121] In some embodiments, the function of controlling the flow can also be integrated into the first valve body 34, that is, the first valve body 34 is an electronic expansion valve. The opening degree of the electronic expansion valve in the open state can be adjusted, so that the flow through the bypass pipe 6 can be adjusted.

[0122] In some examples, the throttling device 61 is a throttle valve, which includes a main pipe portion 611 and a valve core (not shown) arranged in the main pipe portion 611, one port of the main pipe portion 611 is connected with the first branch pipe 23, and the other port of the main pipe portion 611 is connected with the first valve body 34, and the valve core is used to control the flow of refrigerant through the main pipe portion 611, thereby controlling the flow through the first valve body 34.

[0123] Of course, the structure of the throttling device 61 of the present embodiment is not limited to this, for example, as shown in FIG. 6, the throttling device 61 of the present embodiment can also be a capillary assembly, which includes a capillary portion 613 and two connecting sleeves 614 arranged at both ends of the capillary portion 613 respectively, the pipe diameter of the connecting sleeves 614 is larger than that of the capillary portion 613, one of the two connecting sleeves 614 is used to connect the first branch pipe 23, and the other of the two connecting sleeves 614 is used to connect the second branch pipe 33.

[0124] The material of the capillary portion 613 of the present embodiment can be copper, copper alloy or stainless steel, the connecting sleeves 614 are made of copper material (copper or copper alloy), and accordingly, the first branch pipe 23 of the present embodiment is provided with a second copper adapter (not shown), and the second branch pipe 33 is provided with a third copper adapter (not shown), the second copper adapter is connected with one of the connecting sleeves 614, and the third copper adapter is connected with the other connecting sleeve 614, and the connection mode can be welding, so as to realize the copper-copper connection of the capillary portion 613 with the first branch pipe 23 and the second branch pipe 33 respectively.

[0125] The first branch pipe 23 and the second branch pipe 33 of the present embodiment can both be made of stainless steel material, and the bypass pipeline 6 of the present embodiment can be made of stainless steel material or copper material.

[0126] Taking the example that the first branch pipe 23 and the pipeline body 62 are both made of stainless steel material, the first branch pipe 23 is connected with a first transition portion 612, and the pipeline body 62 is connected with another first transition portion 612, the first transition portion 612 is made of copper material, and the main pipe portion 611 of the present embodiment is made of copper material, at this time, the main pipe portion 611 is directly connected with the two first transition portions 612 in copper-copper connection, the first branch pipe 23 is connected with one of the first transition portions 612 in copper and stainless steel connection (for example, welding), and the pipeline body 62 is connected with the other first transition portion 612 in copper and stainless steel connection.

[0127] Of course, in other embodiments, the main body pipe part 611 of the throttle valve can also be made of stainless steel material, at which time a copper adapter (not shown in the figure) for cooperating with the first transition part 612 can be arranged at each end of the main body pipe part 611, and copper-copper connection is realized by the first transition part 612 and the copper adapter.

[0128] Again, in combination with FIGS. 1-5, in some examples, optionally, in order to facilitate the connection of the third branch pipe 25, the first stainless steel pipe 21 of the embodiment is provided with a third opening (not shown in the figure), one connection port of the third branch pipe 25 is connected to the third opening, and the other connection port of the third branch pipe 25 is connected and communicated with the second valve body 26, and the second valve body 26 is used to communicate the defrosting pipeline 301 of the heating and ventilation equipment 1000.

[0129] The defrosting pipeline 301 can be regarded as part of the heat source heat exchanger 30, and the defrosting pipeline 301 is a component to be heated. The defrosting pipeline 301 is communicated with the second valve body 26 arranged on the first pipe joint 2, and the second valve body 26 controls the flow of refrigerant from the first pipe joint 2 to the defrosting pipeline 301. The defrosting pipeline 301 heats the heat source heat exchanger 30 when defrosting is needed to remove the frost layer on the surface thereof.

[0130] When defrosting is performed, the refrigerant flows from the first pipe joint 2 to the defrosting pipeline 301, at which time the second valve body 26 is opened, and the refrigerant enters the defrosting pipeline 301 through the second valve body 26. The refrigerant in the defrosting pipeline 301 transmits heat to the surface of the heat source heat exchanger 30 through heat exchange, and the temperature of the surface of the heat source heat exchanger 30 gradually rises, thereby melting the frost layer.

[0131] By connecting the defrosting pipeline 301 to the first pipe joint 2, the high-temperature and high-pressure gas discharged in the second refrigerant flow path 400 of the compressor 20 can be used for defrosting, the heat in the system is efficiently utilized, no additional heating device is needed, energy is saved, and the defrosting efficiency is improved.

[0132] In some embodiments, the third branch pipe 25 of the embodiment is a copper pipe, and in order to realize copper-copper connection, the second copper connection pipe 261 is arranged on the second valve body 26, and the third branch pipe 25 can be designed of copper (copper or copper alloy), so that the third branch pipe 25 and the second copper connection pipe 261 can be directly connected in copper-copper connection.

[0133] Again, in combination with FIG. 4, in some examples, optionally, the third stainless steel pipe 31 is provided with a fourth opening (not shown in the figure), one connection port of the fourth branch pipe 35 is connected to the fourth opening, and the other connection port of the fourth branch pipe 35 is connected and communicated with the second pressure sensor 36, and the second pressure sensor 36 is a pressure sensor, which can monitor the pressure in the second pipe joint 3 in real time, and ensure that the system operates within a safe pressure range.

[0134] Of course, the second pressure sensor 36 can also be a temperature sensor, which can monitor the temperature in the second pipe joint 3 in real time, to ensure that the refrigerant flows within a suitable temperature range; in addition, the second pressure sensor 36 can also be a flow sensor, which can monitor the refrigerant flow in the second pipe joint 3 in real time, to ensure system operating efficiency.

[0135] Further, the third stainless steel pipe 31 is provided with a fifth opening, one end of a fifth branch pipe 37 is connected to the fifth opening, and the other end of the fifth branch pipe 37 is connected to and communicates with a third valve body 38, which is used to communicate the refrigerant circuit of the heating and air conditioning equipment 1000 with a higher pressure than the refrigerant passage of the second pipe joint 3.

[0136] The third valve body 38 is used to bypass the refrigerant in the second pipe joint 3 to a fluid pipe with higher pressure. It should be noted that the "refrigerant passage with a pressure greater than the second pipe joint 3" refers to another high-pressure area in the refrigerant circulation loop, as shown in FIG. 7. This high-pressure area is the refrigerant pipe between the heat source heat exchanger 30 and the liquid-side stop valve 3001. A subcooling device 500 is provided in the refrigerant pipe between the heat source heat exchanger 30 and the liquid-side stop valve 3001. The subcooling device includes a main cooling path 501 and an auxiliary cooling path 502. The two ends of the main cooling path 501 are connected to the heat source heat exchanger 30 and the liquid-side stop valve 3001, respectively. The auxiliary cooling path 502 branches from the refrigerant pipe in the aforementioned high-pressure area. The branching point can be located between the subcooling device and the liquid-side stop valve 3001, or between the subcooling device and the heat source heat exchanger 30. One port of the third valve body 38 is connected to the fifth branch pipe 37, and the other port of the third valve body 38 leads to the refrigerant outlet of the auxiliary cooling path 502. When the refrigerant flows between the heat source heat exchanger 30 and the liquid-side stop valve 3001, a portion of the refrigerant flows into the auxiliary cooling path 502 of the subcooler through the branching point. The refrigerant in the auxiliary cooling path 502 absorbs heat from the refrigerant in the main cooling path 501, thereby cooling the refrigerant in the main cooling path 501. After absorbing heat, the refrigerant in the auxiliary cooling path 502 flows back to the compressor 20. One of the backflow paths is from the third valve body 38 to the second pipe joint 3, and then to the gas-liquid separator 800. After the refrigerant is separated into gas and liquid in the gas-liquid separator 800, the gas refrigerant flows to the gas inlet of the compressor 20 through the second refrigerant flow path 400 of the gas-liquid separator 800, thereby realizing the backflow of the refrigerant. The other backflow path is the injection backflow path 900. One end of the injection backflow path 900, one end of the third valve body 38, and one end of the auxiliary cooling path 502 form a three-way flow path. The refrigerant in the auxiliary cooling path 502 flows to the injection backflow path 900, and the other end of the injection backflow path 900 communicates with the injection port of the compressor 20, thereby realizing the backflow of the refrigerant.

[0137] It can be understood that the first opening, the second opening, the fourth opening and the fifth opening are not marked in the drawings due to the shielding of the branch pipeline.

[0138] In combination with FIG. 1 again, it can be seen that the sixth stainless steel pipe 42 has a plurality of curved sections, and the eighth stainless steel pipe 52 also has a plurality of curved sections, wherein the axis of the main valve 1, the axis of the seventh stainless steel pipe 51 and the axis of the eighth stainless steel pipe 52 at any position are located in the same plane, and the axis refers to the center line of the pipeline in the length direction.

[0139] Further, the third stainless steel pipe 31 and the fourth stainless steel pipe 32 are straight pipes, and the axes of the third stainless steel pipe 31 and the fourth stainless steel pipe 32 are perpendicular to the axis of the main valve 1.

[0140] In this way, the axis of the first pipe joint 2, the axis of the second pipe joint 3, the axis of the fourth pipe joint 5 and the axis of the main valve 1 are located in the same plane, which can reduce the space occupied by the four-way valve assembly 10 in the outdoor unit of the heating and ventilation equipment 1000.

[0141] In addition, in order to connect the pipeline of the heating and ventilation equipment 1000, the first copper connecting part 211 is arranged on the first end of the first stainless steel pipe 21 of the first pipe joint 2 away from the main valve 1, the second copper connecting part 74 is arranged on the end of the third stainless steel pipe 31 of the second pipe joint 3 away from the main valve 1, the third copper connecting part 421 is arranged on the end of the sixth stainless steel pipe 42 of the third pipe joint 4 away from the main valve 1, and the fourth copper connecting part 521 is arranged on the end of the eighth stainless steel pipe 52 of the fourth pipe joint 5 away from the main valve 1. The first copper connecting part 211, the second copper connecting part 74, the third copper connecting part 421 and the first copper connecting part 211 are all made of copper material.

[0142] The first copper connecting part 211 is a transition structure between the first pipe joint 2 and the second refrigerant discharge flow path 400 of the refrigerant circulation loop, and the copper material has good welding compatibility with the stainless steel material, so that high-strength connection can be achieved by welding. Specifically, the second copper connecting part 74 is arranged on the end of the three-way valve 7 away from the oil separation gas pipe 602, and the first copper connecting part 211 and the second copper connecting part 74 are sleeved and welded with each other.

[0143] Similarly, the second copper connecting part 74, the third copper connecting part 421 and the fourth copper connecting part 521 also play the role of facilitating connection and improving connection strength.

[0144] In some examples, the above functional components (e.g., the first pressure sensor 24, the second pressure sensor 36, the first valve body 34, the second valve body 26, etc.) are provided with a connecting pipe (e.g., the first copper connecting pipe 241 described above), and when the stainless steel pipes of the first pipe joint 2, the second pipe joint 3, and the third pipe joint 4 are connected to the connecting pipe through branch pipes, the following connection modes can be adopted:

[0145] The first mode is that the connecting pipe and the branch pipe are both made of stainless steel material, and the connecting pipe and the branch pipe are directly welded to realize steel-steel connection.

[0146] The second mode is that the connecting pipe is made of copper material, and the branch pipe is made of stainless steel material, and the branch pipe is connected to the connecting pipe through a copper adapter, for example, the first copper adapter 231 of the first branch pipe 23 is connected to the first copper connecting pipe 241 of the first pressure sensor 24, and for another example.

[0147] The third mode is that the connecting pipe is made of copper material, and the branch pipe is made of copper material, and the connecting pipe and the branch pipe can be directly connected in copper-copper mode.

[0148] In the embodiment, the above copper adapter (e.g., the first copper adapter 231, the second copper adapter, and the third copper adapter) can be a copper plating layer applied to the end of the branch pipe, or the copper adapter can be a copper adapter (copper sleeve) connected between the branch pipe and the connecting pipe.

[0149] Based on the four-way valve assembly 10 described above, the present embodiment provides a heating and ventilation equipment 1000 outdoor unit, which includes a shell (not shown in the figure), a heat source heat exchanger 30, a compressor 20, and the four-way valve assembly 10 described above. Among them, the heat source heat exchanger 30, the compressor 20, and the four-way valve assembly 10 are all arranged in the shell, the main valve 1 of the four-way valve assembly 10 is connected between the compressor 20 and the heat source heat exchanger 30, the first pipe joint 2 of the four-way valve assembly 10 is connected to the exhaust port of the compressor 20, and the second pipe joint 3 of the four-way valve assembly 10 is connected to the gas return port of the compressor 20.

[0150] Further, the present embodiment also provides a heating and ventilation equipment 1000, which includes a heating and ventilation equipment 1000 indoor unit and the heating and ventilation equipment 1000 outdoor unit described above, and the load heat exchanger 40 of the heating and ventilation equipment 1000 indoor unit and the heating and ventilation equipment 1000 outdoor unit are connected through a pipeline. The heating and ventilation equipment 1000 further includes a first refrigerant flow path 300, a second refrigerant flow path 400, a supercooling device 500, an oil separation assembly 600, an oil return capillary tube 700, and a gas-liquid separator 800.

[0151] The compressor 20 has an exhaust port and a suction port, the first pipe joint 2 of the four-way valve assembly 10 is communicated with the exhaust port, the second pipe joint 3 of the four-way valve assembly 10 is communicated with the suction port, the third pipe joint 4 of the four-way valve assembly 10 is communicated with the heat source heat exchanger 30, and the fourth pipe joint 5 of the four-way valve assembly 10 is communicated with the load heat exchanger 40.

[0152] The compressor 20 compresses the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas, discharges the high-temperature and high-pressure refrigerant gas through the exhaust port of the compressor 20, and inhales the low-temperature and low-pressure refrigerant gas through the suction port of the compressor 20. The heat source heat exchanger 30 cools and condenses the high-temperature and high-pressure refrigerant gas into liquid, and releases the heat in the refrigerant to the environment. The four-way valve assembly 10 is used to switch the flow direction of the refrigerant to realize the conversion between the cooling mode and the heating mode. The load heat exchanger 40 absorbs heat to evaporate the low-temperature and low-pressure refrigerant liquid into gas, thereby realizing the refrigeration effect by heat absorption. The first refrigerant flow path 300 is used to transport the condensed liquid refrigerant and is connected between the heat source heat exchanger 30 and the load heat exchanger 40. The second refrigerant flow path 400 is used to transport the evaporated gaseous refrigerant and is connected between the load heat exchanger 40 and the four-way valve assembly 10.

[0153] The defrosting pipeline 301 of the heat source heat exchanger 30 is communicated with the second valve body 26 arranged on the first pipe joint 2, the supercooling device 500 includes a main cooling path 501 and an auxiliary cooling path 502, the auxiliary cooling path 502 absorbs heat from the main cooling path 501, the main cooling path 501 is arranged between the heat source heat exchanger 30 and the first refrigerant flow path 300, one end of a branch pipe formed by branching the refrigerant pipeline between the main cooling path 501 and the first refrigerant flow path 300 is communicated with the auxiliary cooling path 502, and the other end of the auxiliary cooling path 502 is communicated with the third valve body 38 arranged on the second pipe joint 3.

[0154] The inlet of the main cooling path 501 is connected with the outlet of the heat source heat exchanger 30, and the outlet of the main cooling path 501 is connected with the first refrigerant flow path 300. After the refrigerant comes out of the heat source heat exchanger 30, it is further cooled through the main cooling path 501, and then flows to the load heat exchanger 40 through the first refrigerant flow path 300. The main cooling path 501 is used to further cool the high-temperature and high-pressure liquid refrigerant coming out of the heat source heat exchanger 30. The inlet of the auxiliary cooling path 502 is connected with the main cooling path 501, and the outlet of the auxiliary cooling path 502 is connected with the second pipe joint 3 through the third valve body 38. The auxiliary cooling path 502 further reduces the temperature of the refrigerant by absorbing heat from the main cooling path 501, so that the refrigerant reaches a lower temperature before entering the load heat exchanger 40.

[0155] The oil separation assembly 600 comprises two oil separation tanks 601 and two oil discharge pipes 602 respectively connected to the two oil separation tanks 601, and the first pipe joint 2 is connected to the two oil discharge pipes 602 through the three-way valve 7.

[0156] The oil separation tank 601 is used to separate the lubricating oil in the refrigerant. After passing through the compressor 20, the refrigerant usually carries a certain amount of lubricating oil. The oil separation tank 601 separates the lubricating oil from the refrigerant by gravity separation or centrifugal separation. In this embodiment, the oil separation assembly 600 comprises two oil separation tanks 601, which can improve the separation efficiency. Each oil separation tank 601 is connected to the three-way valve 7 through an oil discharge pipe 602, so that the separated refrigerant gas can enter the subsequent refrigeration cycle. Each oil separation tank 601 is connected to the three-way valve 7 through an oil discharge pipe 602, and the three-way valve 7 comprises a first interface 71, a second interface 72 and a third interface 73. The first interface 71 is connected to the first pipe joint 2, and the second interface 72 and the third interface 73 are connected to the two oil discharge pipes 602 respectively. The three-way valve 7 combines the refrigerant gas in the two oil discharge pipes 602 and then sends it to the first pipe joint 2. By setting the three-way valve 7, the refrigerant flow in the two oil discharge pipes 602 can be adjusted to ensure the balanced operation of the system.

[0157] Each oil separation tank 601 is provided with an oil return port at the bottom or side. The inlet end of the oil return capillary tube 700 is connected to the oil return port of the oil separation tank 601. The oil return capillary tube 700 can be fixed to the oil return port of the oil separation tank 601 by welding or screw connection. The outlet end of the oil return capillary tube 700 is connected to the second refrigerant return flow path 400 of the compressor 20.

[0158] During oil separation, the high-temperature and high-pressure refrigerant gas discharged from the compressor 20 first enters the oil separation tank 601. In the oil separation tank 601, the lubricating oil in the refrigerant is separated out by gravity or centrifugal force. The separated lubricating oil returns to the compressor 20 through the oil return pipe, ensuring the normal operation of the lubrication system of the compressor 20 and improving the reliability of the operation of the compressor 20. The separated gaseous refrigerant flows out of the oil separation tank 601 through the oil discharge pipe 602. The refrigerant gas in the two oil discharge pipes 602 is combined through the three-way valve 7 and then enters the first pipe joint 2. The combined refrigerant gas enters the four-way valve assembly 10 through the first pipe joint 2 and continues to participate in the refrigeration cycle.

[0159] In the embodiment, the number of compressors 20 is two, and the oil separation assembly 600 further comprises two oil separation inlet pipes 603 respectively communicating with the two oil separation tanks 601, and the exhaust ports of the two compressors 20 are in one-to-one correspondence with the two oil separation inlet pipes 603. By arranging two compressors 20 operating in parallel, the refrigeration load can be borne together to realize greater refrigeration output and improve the refrigeration capacity of the system. When the system load is low, only one compressor 20 can be operated to avoid unnecessary energy consumption; when the load increases, the second compressor 20 is started to ensure that the system always operates in an efficient state. The double-compressor 20 structure can flexibly adjust the operating state of the compressor 20 according to different working conditions, optimize the compression process, and improve the overall energy efficiency of the system.

[0160] The gas-liquid separation assembly comprises at least one gas-liquid separator 800 arranged between the second pipe joint 3 of the four-way valve assembly 10 and the return gas port of the compressor 20. The gas-liquid separator 800 separates the gas-liquid mixture flowing out of the four-way valve assembly 10, ensures that mainly gas enters the return gas port of the compressor 20, avoids liquid from entering the compressor 20 to cause liquid hammer and other faults, and ensures stable operation of the system.

[0161] As shown in FIG. 7, in the refrigeration mode, the two compressors 20 respectively suck in low-temperature and low-pressure refrigerant gas, and change it into high-temperature and high-pressure refrigerant gas through compression. The high-temperature and high-pressure refrigerant gas is discharged from the exhaust port of the compressor 20, enters the two oil separation tanks 601 through the oil separation inlet pipes 603, respectively. In the oil separation tank 601, the lubricating oil is separated out by the action of gravity or centrifugal force, the separated lubricating oil returns to the return gas port of the compressor 20 through the oil return pipe, and the separated high-temperature and high-pressure refrigerant gas flows out of the oil separation tank 601 through the oil separation outlet pipe 602. The high-temperature and high-pressure refrigerant gas enters the four-way valve assembly 10 through the first pipe joint 2. The four-way valve assembly 10 switches the flow direction of the refrigerant, so that the refrigerant flows from the first pipe joint 2 to the third pipe joint 4, and the high-temperature and high-pressure refrigerant gas enters the heat source heat exchanger 30 through the third pipe joint 4. In the heat source heat exchanger 30, the high-temperature and high-pressure refrigerant gas is cooled and condensed into liquid, releases heat to the environment, and the condensed liquid refrigerant flows to the load heat exchanger 40 through the first refrigerant flow path 300. In the load heat exchanger 40, the liquid refrigerant absorbs heat and evaporates into gas to achieve refrigeration effect, and the evaporated low-temperature and low-pressure refrigerant gas returns to the four-way valve assembly 10 through the second refrigerant flow path 400. The four-way valve assembly 10 guides the low-temperature and low-pressure refrigerant gas from the fourth pipe joint 5 to the second pipe joint 3, and the low-temperature and low-pressure refrigerant gas returns to the return gas port of the compressor 20 through the second pipe joint 3 after being separated by the gas-liquid separator, completing a refrigeration cycle.

[0162] As shown in FIG. 8, in the heating mode, the four-way valve assembly 10 switches the refrigerant flow direction, so that the refrigerant flows from the first pipe joint 2 to the fourth pipe joint 5, and the high-temperature and high-pressure refrigerant gas enters the load heat exchanger 40 through the fourth pipe joint 5. In the load heat exchanger 40, the high-temperature and high-pressure refrigerant gas releases heat to achieve the heating effect, and the refrigerant gas is condensed into a liquid state in the load heat exchanger 40. The condensed liquid refrigerant flows to the heat source heat exchanger 30 through the first refrigerant flow path 300, and in the heat source heat exchanger 30, the liquid refrigerant absorbs heat and evaporates into a gas. The evaporated low-temperature and low-pressure refrigerant gas returns to the four-way valve assembly 10 through the second refrigerant flow path 400. The four-way valve assembly 10 guides the low-temperature and low-pressure refrigerant gas from the third pipe joint 4 to the second pipe joint 3. After the low-temperature and low-pressure refrigerant gas is separated by the gas-liquid separator, it returns to the compressor 20 through the second pipe joint 3, and a heating cycle is completed.

[0163] Embodiment Two

[0164] In combination with FIG. 9 and FIG. 10, the present embodiment provides another four-way valve assembly 10, which includes a main valve 1, a first pipe joint 2, a second pipe joint 3, a third pipe joint 4, and a fourth pipe joint 5. The main valve 1 is a cylindrical structure with two closed ends and an internal cavity. A switching mechanism (not shown in the figure) is arranged in the cavity. A pilot valve 101 is mounted on the outside of the main valve 1. The pilot valve 101 is connected to the cavity of the main valve 1 through two capillary tubes, and can drive the switching mechanism to act to switch direction.

[0165] The first pipe joint 2, the second pipe joint 3, the third pipe joint 4, and the fourth pipe joint 5 are all pipe joint segments extending outward from the side wall of the main valve 1. A one-way valve 27 is arranged on the first pipe joint 2 to connect the compressor exhaust pipe 201 of the heating and ventilation equipment. The compressor exhaust pipe 201 can be understood as a D pipe for connecting the exhaust port of the compressor 20. The end of the first pipe joint 2 away from the four-way valve body is provided with an air inlet. The air inlet is used to communicate with the compressor exhaust pipe 201. The refrigerant flowing out of the exhaust port of the compressor 20 passes through the compressor exhaust pipe 201 and the first pipe joint 2 in sequence and enters the cavity of the four-way valve assembly 10.

[0166] The second pipe joint 3 is used to connect the compressor return pipe 202 of the heating and ventilation equipment. The compressor return pipe 202 can be understood as an S pipe for connecting the return port of the compressor 20. The second pipe joint 3 and the first pipe joint 2 can be located on two sides of the four-way valve body in the radial direction. The refrigerant in the four-way valve assembly 10 can flow back to the compressor 20 through the second pipe joint 3 and the compressor return pipe 202 in sequence.

[0167] The third pipe joint 4 is used to connect the first refrigerant flow path 300, which can be understood as an E pipe used to connect the heat source heat exchanger 30, and the fourth pipe joint 5 is used to connect the second refrigerant flow path 400, which can be understood as a C pipe used to connect the load heat exchanger 40, so that the refrigerant can flow between the heat source heat exchanger 30 and the load heat exchanger 40 of the heating and ventilation device 1000.

[0168] Unlike the related art, which connects the pressure sensor and the four-way valve through an intermediate structure (such as a bracket, a pipeline, etc.), the first pressure sensor 24 of the present embodiment is directly integrated on the four-way valve body and is in communication with the first pipe joint 2. The first pressure sensor 24 can be installed on the part of the first pipe joint 2 except the one-way valve 27, or can be installed on the one-way valve 27.

[0169] The first pressure sensor 24 is used to detect the pressure information in the first pipe joint 2, which can be high pressure information in the first pipe joint 2. Through the high pressure information, the flow rate of the fluid can be calculated, and the high pressure information can be fed back to the control system for automatic or manual adjustment of the opening degree of the four-way valve to achieve the required flow regulation of the system. In addition, through the first pressure sensor 24, the fluid pressure change in the system can be monitored in real time, which helps to diagnose problems such as pipe blockage, valve failure or system leakage in a timely manner. The above-mentioned high pressure information refers to a pressure range that can be between tens to hundreds of pascals (Pa) to several hundred kilopascals (kPa). The specific range depends on the design pressure of the air conditioning system and the type of refrigerant used. For example, for common refrigerants, the high pressure range can be between 3000 kPa (3 MPa) and 4500 kPa (4.5 MPa).

[0170] In the present embodiment, the first pressure sensor 24 is directly installed on the first pipe joint 2, and the intermediate structure for connecting the first pressure sensor 24 and the four-way valve body is omitted, thereby being able to simplify the structure of the machine body to a certain extent, reduce the overall volume of the machine body, and also reduce the production manufacturing cost to a certain extent.

[0171] The "direct installation" described in the present embodiment means that at least part of one component is directly connected to another component, for example, at least part of the first pressure sensor 24 of the present embodiment is directly connected to the first pipe joint 2. Similarly, the direct installation of the second pressure sensor 36 described below can also be understood in this way. Unlike the "direct installation" described above, the related art is to install the first pressure sensor 24 and the second pressure sensor 36 on the exhaust pipe of the compressor.

[0172] In order to be able to detect the pressure information in the second pipe joint 3, in some examples, the four-way valve assembly 10 of the present embodiment also comprises a second pressure sensor 36, which is the same as or similar to the first pressure sensor 24 described above, for example, both can be pressure sensors, and the detection range of the second pressure sensor 36 can be different from that of the first pressure sensor 24, for example, the first pressure sensor 24 can detect high pressure information, and the second pressure sensor 36 is used to detect low pressure information of the second pipe joint 3, which can be between tens of kilopascals and hundreds of kilopascals, for example, between 300 kPa (0.3 MPa) and 700 kPa (0.7 MPa).

[0173] Similarly to the installation method of the first pressure sensor 24, the second pressure sensor 36 of the present embodiment is also directly installed on the second pipe joint 3 and communicates with the second pipe joint 3, thereby further saving space in the engine and simplifying the structure.

[0174] The first pressure sensor 24 and the second pressure sensor 36 of the present embodiment can each comprise a shell and an internal pressure sensing element, the shell can be the same as or similar to the material of the first pipe joint 2 and the second pipe joint 3, and the shell can further comprise a pipe segment for connecting and communicating with the first pipe joint 2 or the second pipe joint 3, which is different from the existing intermediate pipe for connecting the sensor and the four-way valve. The length of the pipe segment of the shell in the present embodiment is small, and it belongs to the shell or the sensor.

[0175] In some examples, the first pressure sensor 24 can be integrally connected with the first pipe joint 2, and the second pressure sensor 36 can also be integrally connected with the second pipe joint 3, the integrally connected manner in the present embodiment can include welding, bonding, hot melting connection, etc., and can also include an integral molding manner during processing.

[0176] In addition, the four-way valve assembly 10 of the present embodiment also comprises a one-way valve 27, which is part of the first pipe joint 2, and the one-way valve 27 can be integrally formed with the first pipe joint 2 or connected integrally by welding. The one-way valve 27 functions to allow the refrigerant to enter the four-way valve assembly 10 only from the compressor, and prevents the refrigerant from flowing back to the compressor 20 from the four-way valve assembly 10.

[0177] Specifically, the one-way valve 27 is used to communicate with the exhaust port of the compressor 20 through the compressor exhaust pipe 201, and the one-way valve 27 is configured to switch between an open state and a closed state. In the open state, the one-way valve 27 conducts the first pipe joint 2 and the exhaust port, and in the closed state, the one-way valve 27 cuts off the communication between the first pipe joint 2 and the exhaust port of the compressor.

[0178] The one-way valve 27 of the embodiment comprises a valve pipe and a valve core (not shown in the figure) connected in the valve pipe, and the valve pipe is directly integrally formed with or connected with the first pipe joint 2, so as to realize the integration of the one-way valve 27 and the first pipe joint 2. The specific structure of the one-way valve 27 of the embodiment is the same as or similar to the related art, only the installation position is different, so the embodiment does not make too much description on the specific structure of the one-way valve.

[0179] In order to facilitate the assembly of the pilot valve 101, the structure of the four-way valve assembly 10 is improved in the embodiment, and in some examples, the four-way valve assembly 10 further comprises a mounting member 8 provided with a connecting hole 81 through which the first pipe joint 2 passes, the mounting member 8 is sleeved on the first pipe joint 2 through the connecting hole 81, and the pilot valve 101 is connected to the mounting member 8.

[0180] The mounting member 8 of the embodiment can be a plate or sheet structure, in order to be able to be more stably connected to the main valve 1, the surface of the mounting member 8 of the embodiment facing the main valve 1 can be designed as a circular arc surface, which is fitted with the outer wall surface of the main valve 1.

[0181] Further, the mounting member 8 and the outer wall of the main valve 1 can be connected by bolts, screws and the like, so as to further improve the mounting stability of the mounting member 8 and the pilot valve 101.

[0182] The end of the mounting member 8 close to the pilot valve 101 is provided with a bent upturned portion 82 relative to the mounting member 8, and the pilot valve 101 can be mounted on the upturned portion 82 by bolts and the like, and fitted with the outer wall of the main valve 1.

[0183] In addition, in some embodiments, the first pressure sensor 24 can be used to simultaneously collect pressure information in the first pipe joint 2 and the second pipe joint 3.

[0184] In combination with FIG. 11, one part of the first pressure sensor 24 of the embodiment is mounted on the first pipe joint 2, and the other part is mounted on the second pipe joint 3, and the first pressure sensor 24 is configured to be able to simultaneously detect the pressure information of the first pipe joint 2 and the second pipe joint 3.

[0185] The first pressure sensor 24 comprises a pressure detecting mechanism, a first conducting member 242 and a second conducting member 243. The pressure detecting mechanism can comprise one or more pressure detecting elements, and the circuit of one pressure detecting element can process and distinguish the pressure signals from the first pipe joint 2 and the second pipe joint 3 respectively. The pressure detecting mechanism is located in the housing, and thus is not shown in the figure. Of course, two pressure detecting elements can be integrated in one sensor housing, one of which is directly connected to the first conducting member 242, and the other of which is directly connected to the second conducting member 243, and the two pressure detecting elements process the pressure signals from the first pipe joint 2 and the second pipe joint 3 respectively (this embodiment is not shown in the figure).

[0186] The pressure detecting mechanism of the embodiment can be located in the sensor housing, one end of the first conducting member 242 is connected to and communicates with the housing of the pressure detecting mechanism, and the other end of the first conducting member 242 is connected to and communicates with the first pipe joint 2.

[0187] Similarly, one end of the second conducting member 243 of the embodiment is connected to and communicates with the pressure detecting mechanism, and the other end of the second conducting member 243 is connected to and communicates with the second pipe joint 3, and the pressure detecting mechanism is configured to detect the pressure information in the first pipe joint 2 through the first conducting member 242 and detect the pressure information in the second pipe joint 3 through the second conducting member 243.

[0188] The first conducting member 242 and the second conducting member 243 can be rigid or flexible pipe structures, which are part of the first pressure sensor 24 and are used to assist the pressure detecting mechanism to collect the pressure information of the first pipe joint 2 and the second pipe joint 3.

[0189] This structure integrates the first pressure sensor 24 and the second pressure sensor 36 in the first embodiment to realize the pressure detection of the first pipe joint 2 and the second pipe joint 3 through only the first pressure sensor 24, which can further simplify the structure, improve the integration of the four-way valve assembly 10, and reduce the volume of the machine body.

[0190] In some examples, the first conducting member 242 can be integrally connected to the first pipe joint 2, and the second conducting member 243 can also be integrally connected to the second pipe joint 3. The integral connection can be welding, bonding, hot melt connection, etc., and can also include an integral molding method during processing.

[0191] In order to further optimize the space, and to avoid the structure of the pilot valve 101 and the like, in some examples, the second guide 243 of the present embodiment is optionally provided with a bending portion 2431, which is arranged to face the main valve 1, the first pipe joint 2 and the second pipe joint 3, and is spaced apart from part of the main valve 1, part of the first pipe joint 2 and part of the second pipe joint 3, so that the bending portion 2431, the main valve 1, part of the main valve 1, part of the first pipe joint 2 and part of the second pipe joint 3 enclose an installation space 2432.

[0192] Part of the pilot valve 101 of the present embodiment is located in the installation space 2432, so that the second guide 243 and the pilot valve 101 reduce the possibility of interfering with each other, and when the second guide 243 is a rigid structure, the second guide 243 can also be used to support and protect the outer side of the pilot valve 101.

[0193] In combination with Fig. 12, in some embodiments, the four-way valve assembly 10 of the present embodiment further comprises a second filter 43, which is directly connected to the third pipe joint 4 of the four-way valve body and is used to filter the refrigerant in the third pipe joint 4.

[0194] That is, the second filter 43 is directly integrated on the third pipe joint 4 of the present embodiment, and the second filter 43 has two structural forms.

[0195] The first one is as shown in Figs. 13-16, the second filter 43 comprises a filter cylinder 431 and one or more first filter members 432 located on the filter cylinder 431, the radial dimension of the filter cylinder 431 can be larger than the radial dimension of the third pipe joint 4 as shown in Figs. 5 and 6, or the radial dimension of the filter cylinder 431 can be equal to or smaller than the radial dimension of the third pipe joint 4 as shown in Figs. 7 and 8, one end of the filter cylinder 431 is directly mounted on the gas outlet of the third pipe joint 4, and the connection between the filter cylinder 431 and the third pipe joint 4 of the present embodiment can be an integral connection such as welding. The first filter member can be a filter screen or the like structure to filter the refrigerant flowing out of the third pipe joint 4. The filter cylinder 431 and the third pipe joint 4 can be connected by welding, and the welding point can be a structure between the two as shown in Figs. 6 and 8.

[0196] In some embodiments, the filter cylinder 431 of the present embodiment can be designed to include a first variable diameter section 4311, a diameter expanding section 4312 and a second variable diameter section 4313 connected in sequence, one end of the first variable diameter section 4311 is connected to the third pipe joint 4, the inner diameter of the first variable diameter section 4311 gradually increases in a manner away from the third pipe joint 4, and the minimum inner diameter of the first variable diameter section 4311 is greater than or equal to the inner diameter of the third pipe joint 4.

[0197] The inner diameter of the diameter expansion section 4312 is greater than the inner diameter of the third pipe joint 4, and the inner diameter of the diameter expansion section 4312 is greater than or equal to the maximum inner diameter of the first diameter change section 4311. The second diameter change section 4313 is connected to one end of the diameter expansion section 4312 away from the third pipe joint 4, and the inner diameter of the second diameter change section 4313 gradually decreases in the direction away from the third pipe joint 4.

[0198] Because the inner diameter of the filter cartridge 431 is large, the filtering area of the first filter element 432 can be increased, and the filtering efficiency can be improved. Moreover, the flow rate of the refrigerant after entering the filter cartridge 431 is increased, and the filtering efficiency is further improved.

[0199] As shown in FIG. 17, the second type is to directly arrange the second filter 43 in the third pipe joint 4 to filter the refrigerant in the third pipe joint 4. The second filter 43 of this type can include one or more second filter elements 433 directly installed in the third pipe joint 4, and the second filter element 433 can also be a filter screen or the like. The second filter 43 of this type occupies less space in the machine body than the first type, and has a higher degree of integration.

[0200] In combination with FIG. 18, the present embodiment also provides a heating and cooling equipment outdoor unit 100, which includes a shell (not shown in the figure), a heat source heat exchanger 30, a gas-liquid separator 800, a compressor 20 (not shown in the figure), and the four-way valve assembly 10 according to any one of the above embodiments one to three. The four-way valve assembly 10 is connected and communicated with the compressor 20 and the heat exchanger, respectively.

[0201] Specifically, the first pipe joint 2 of the four-way valve assembly 10 can be communicated with the exhaust port of the compressor 20 through a compressor exhaust pipe 201, the second pipe joint 3 can be communicated with the return air port of the compressor 20 through a compressor return air pipe 202, the third pipe joint 4 can be communicated with the heat source heat exchanger 30 through the first refrigerant flow path 300, and the fourth pipe joint 5 can be communicated with the heat source heat exchanger 30 of the heating and cooling equipment indoor unit 200 through the second refrigerant flow path 400.

[0202] The refrigerant in the compressor 20 enters the main valve 1 in sequence through the compressor return air pipe 202 and the second pipe joint 3, then flows into the first refrigerant flow path 300 through the third pipe joint 4, is processed by the expansion valve 3002 and the liquid-side stop valve 3001 and the like on the first refrigerant flow path 300, and then flows into the heat source heat exchanger 30. The refrigerant in the heat source heat exchanger 30 is processed by the gas-side stop valve 54 on the second refrigerant flow path 400, then enters the fourth pipe joint 5, and then returns to the main valve 1. Subsequently, the refrigerant enters the gas-liquid separator 800 through the first pipe joint 2 and the compressor exhaust pipe 201 to separate oil, and then returns to the compressor to complete the refrigerant circulation.

[0203] The structure of other parts of the air conditioning outdoor unit 100 except the four-way valve assembly 10 can refer to related technologies, which will not be described herein.

[0204] In combination with FIG. 18, the embodiment provides an air conditioning device, which includes the air conditioning outdoor unit 100 described above. In some embodiments, the air conditioning device further includes an air conditioning indoor unit 200, and the air conditioning indoor unit 200 and the air conditioning outdoor unit 100 are connected through pipelines.

[0205] Since the refrigerant cycle has been described in Embodiment Four, the embodiment will not be described herein. In addition, the structure of the air conditioning indoor unit 200 can refer to related technologies, which will not be described herein.

[0206] Embodiment Three

[0207] In combination with FIG. 20, the embodiment provides a four-way valve assembly 10, and the structure of the four-way valve body is the same as or similar to that of Embodiment Two. The difference is that the four-way valve assembly 10 of the embodiment further includes a first pressure switch 28 and / or a second pressure switch 39.

[0208] When the first pressure switch 28 and the second pressure switch 39 are included, the first pressure switch 28 is directly installed on the first pipe joint 2 and communicates with the first pipe joint 2. The second pressure switch 39 is directly installed on the second pipe joint 3 and communicates with the second pipe joint 3. Compared with the way of indirectly installing the first pressure switch 28 and the second pressure switch 39 through the intermediate pipeline, the first pressure switch 28 and the second pressure switch 39 are directly installed on the first pipe joint 2 in the embodiment, and when the pressure in the first pipe joint 2 reaches the threshold value, the corresponding control can be more accurate and fast.

[0209] The first pressure switch 28 can be a high-pressure pressure switch, and the second pressure switch 39 can be a low-pressure pressure switch. Here, “low pressure” and “high pressure” can be understood in the same way as in Embodiment One.

[0210] The first pressure switch 28 monitors and controls the high-pressure state of the air conditioning device to ensure that the system operates within a safe range. The first pressure switch 28 is used to detect the pressure information in the first pipe joint 2, and when the pressure exceeds the preset safety threshold, the first pressure switch 28 will cut off the power supply or send a signal to stop the operation of the compressor. The first pressure switch 28 can prevent the compressor from being damaged due to high exhaust pressure, and also reduce other possible damages to the system, such as refrigerant leakage or other component failures.

[0211] The second pressure switch 39 monitors and controls the low pressure state of the heating and ventilation device, ensures that the system operates within a safe range, and is used to detect the pressure information in the second pipe joint 3. When the pressure is lower than the preset safety threshold, the second pressure switch 39 will cut off the power supply or send a signal to stop the operation of the compressor. The second pressure switch 39 can avoid the compressor running abnormally due to low pressure state, such as liquid operation or poor refrigeration effect.

[0212] Although the functions of the first pressure switch 28 and the second pressure switch 39 and the functions of the first pressure sensor 24 and the second pressure sensor 36 both include detecting the pressure in the pipeline, the main role of the first pressure sensor 24 and the second pressure sensor 36 is to monitor the pressure in the system in real time, so that the system can be dynamically adjusted to maintain within a safe range. The purpose of setting the first pressure switch 28 and the second pressure switch 39 is to provide a safe and redundant protection mechanism, form a safe emergency mechanism, and the combination of pressure switches and pressure detection components can provide more comprehensive pressure management and safety protection.

[0213] In order to facilitate the installation and connection of the first pressure switch 28 and the second pressure switch 39 of the embodiment, a third connection interface and a fourth connection interface (not shown in the figure) can also be provided on the first pipe joint 2 of the embodiment. The first pressure switch 28 is directly installed on the third connection interface, and the second pressure switch 39 is directly installed on the fourth connection interface. The third connection interface and the fourth connection interface are the same as or similar to the first connection interface and the second connection interface described above, for example, the third connection interface and the fourth connection interface can both be an opening structure, or an opening structure and a small connecting pipe outside the opening structure.

[0214] Again, as shown in Figure 19, in some embodiments, the four-way valve assembly 10 further comprises a first temperature sensor 29 and / or a second temperature sensor 310. The first temperature sensor 29 is directly installed on the first pipe joint 2 and is used to detect the temperature in the first pipe joint 2. The second temperature sensor 310 is directly installed on the second pipe joint 3 and is used to detect the temperature in the second pipe joint 3.

[0215] The first temperature sensor 29 and the first pressure switch 28 can be selected or simultaneously exist, and the second temperature sensor 310 and the second pressure switch 39 can be selected or simultaneously exist.

[0216] The connection mode of the first temperature sensor 29 and the first pipe joint 2 can be integral connection mode such as welding and bonding. Similarly, the connection mode of the second temperature sensor 310 and the second pipe joint 3 can also be integral connection mode such as welding and bonding.

[0217] The first temperature sensor 29 can detect the temperature of the first pipe joint 2 (high pressure side), and the second temperature sensor 310 can detect the temperature of the second pipe joint 3 (high pressure side), so as to ensure the refrigerant flow and heat exchange efficiency, prevent the system from being overheated or overcooled, and protect the system components. Moreover, by obtaining comprehensive temperature data, the system can be operated in an optimal state, and potential problems can be found and solved in time.

[0218] In order to facilitate the installation and connection of the first temperature sensor 29 and the second temperature sensor 310 of the embodiment, a fifth connection interface and a sixth connection interface (not shown in the figure) can also be arranged on the first pipe joint 2 of the embodiment. The first temperature sensor 29 is directly installed on the fifth connection interface, and the second temperature sensor 310 is installed on the sixth connection interface. The fifth connection interface and the sixth connection interface are the same as or similar to the third connection interface and the fourth connection interface.

[0219] Compared with the mode of indirectly installing the first temperature sensor 29 and the second temperature sensor 310 through the intermediate pipe, the first temperature sensor 29 and the second temperature sensor 310 of the embodiment are directly installed on the first pipe joint 2, so that the temperature detection in the first pipe joint 2 and the second pipe joint 3 can be more accurate and rapid.

[0220] In combination with FIG. 22, in some embodiments, the first temperature sensor 29 of the embodiment includes a first heat conduction member 291 and a first temperature detection member 292. The first heat conduction member 291 can be made of a heat conduction material in whole or in part. The heat conduction material can be iron, copper, aluminum metal or alloy material, or carbon fiber, ceramic or other heat conduction material. The first temperature detection member 292 can be a temperature sensor or other temperature detection element.

[0221] Specifically, the material of the first heat conduction member 291 can be designed to be the same as that of the first pipe joint 2, and the two are integrally connected by welding, so as to improve the connection stability and the heat conduction performance.

[0222] The first heat conduction member 291 can be in the shape of a cylinder, a square column or the like. The first heat conduction member 291 is provided with a circular arc surface on the outside, which is matched with the outer wall surface of the first pipe joint 2, so as to facilitate the installation of the first heat conduction member 291 on the first pipe joint 2. The first heat conduction member 291 is provided with a first accommodating cavity in the inside, and the first temperature detection member 292 is installed in the first accommodating cavity and is in close contact with the inner wall of the first heat conduction member 291. When the temperature is detected, the first heat conduction member 291 transmits the temperature of the first pipe joint 2 to the first temperature detection member 292, so as to realize the temperature detection of the first pipe joint 2.

[0223] In order to facilitate the installation of the first temperature detecting member 292 and facilitate the connection of the first temperature detecting member 292 to other control structures through a wire, a first opening 2911 can be further arranged at one end (the upper end in the figure) of the first heat conducting member 291 of the embodiment, and the first temperature detecting member 292 is inserted into the first accommodating cavity through the first opening 2911. After the first temperature detecting member 292 is installed into the first accommodating cavity, it is necessary to ensure that the first temperature detecting member 292 can be tightly attached or pressed against the inner wall surface of the first heat conducting member 291. Therefore, the shape of the first temperature detecting member 292 needs to be matched with the shape of the first accommodating cavity.

[0224] The structure of the second temperature sensor 310 of the embodiment can be the same as or different from the first temperature sensor 29. When the structure of the second temperature sensor 310 of the embodiment is the same as that of the first temperature sensor 29, the second temperature sensor 310 includes a second heat conducting member and a second temperature detecting member (not labeled in the figure) installed in the second heat conducting member. The second heat conducting member has the same structure and material as the first heat conducting member 291, and the second temperature detecting member has the same structure as the first temperature detecting member 292. Therefore, the second temperature sensor 310 will not be described in detail in the embodiment, and those skilled in the art can understand the second temperature sensor 310 by referring to the first temperature sensor 29.

[0225] In combination with FIG. 21, in some embodiments, in addition to the first temperature sensor 29, the second temperature sensor 310, the first pressure switch 28, and the second pressure switch 39, the first pressure sensor 24 can also be used to detect the pressure in the first pipe joint 2 and the second pipe joint 3 at the same time.

[0226] In combination with FIGS. 23 to 26, in some embodiments, the four-way valve assembly 10 of the embodiment further includes a switching device 9 installed in the main valve 1 and used for electrically connecting the electrical device and the main control board of the HVAC outdoor unit.

[0227] The switching device 9 can be an electric control box, an electrical device switching box, etc. The switching device 9 can also include a middle board 91 in FIG. 8, and the middle board 91 is a circuit board.

[0228] The first pressure sensor 24 and the second pressure sensor 36 can be connected to the middle board 91 through wires, respectively, and then electrically connected to the main control board of the HVAC outdoor unit through the middle board 91.

[0229] The first pressure switch 28, the second pressure switch 39, the first temperature sensor 29, and the second temperature sensor 310 can also be directly connected to the middle board 91 through conductive wires, and then electrically connected to the main control board of the HVAC outdoor unit through the middle board 91.

[0230] Wherein, the first pressure sensor 24, the first temperature sensor 29, the second temperature sensor 310, the first pressure switch 28 and the second pressure switch 39 are directly connected to the middle plate 91 through conductive lines, the four-way valve assembly 10 in Fig. 23 has the second filter 43, and the four-way valve assembly 10 in Figs. 24 and 25 does not include the second filter 43.

[0231] By connecting the above-mentioned electrical device to the middle plate 91 first, and then connecting the main control board through the middle plate 91, compared with the way of directly connecting the above-mentioned functional devices to the main control board respectively, the conductive lines can be simplified, the internal space of the HVAC outdoor unit body can be further saved, and the production efficiency can be improved and the production cost can be reduced.

[0232] The switching device 9 and the pilot valve 101 of the embodiment are located on opposite sides of the main valve 1, the switching device 9 can only include one middle plate 91, the middle plate 91 is directly installed on the main valve 1, or the switching device 9 is designed to include a mounting seat 92 and a middle plate 91, the mounting seat is installed on the main valve 1, the mounting seat 92 is provided with a receiving groove, and the middle plate 91 is installed in the mounting seat, and the middle plate 91 is used to connect the main control board.

[0233] Further, the switching device 9 can further include a cover 93, the cover 93 is covered on the mounting seat, the mounting mode can be a clamping, bolt connection or other convenient disassembly mode, the mounting seat and the cover 93 form a box structure, and the cover 93 and the receiving groove of the mounting seat form a cavity for installing the middle plate 91. In addition, a wire hole needs to be formed on the cover 93 or the mounting seat, so that the above-mentioned functional devices are connected to the middle plate 91.

[0234] In some embodiments, a first wire hole 921 and a second wire hole 922 can be formed on the side wall of the mounting seat 92, the first wire hole 921 is used for allowing one end of a line to pass through and be inserted into the middle plate 91, and the second wire hole is used for allowing one end of another line to pass through and be inserted into the middle plate 91.

[0235] The above-mentioned is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A four-way valve assembly for use in a heating, ventilation, and air conditioning system having a compressor, wherein, The four-way valve assembly comprises: a main valve; a first pipe joint comprising at least one stainless steel pipe, one end of the first pipe joint being connected to and in communication with the main valve, and the other end being connected to an exhaust port of the compressor; a second pipe joint comprising at least one stainless steel pipe, one end of the second pipe joint being connected to and in communication with the main valve, and the other end being connected to a return port of the compressor; and a plurality of functional components, such as valve bodies, sensors, or pressure switches, at least one of the functional components being connected to at least one of the stainless steel pipes of the first pipe joint, and at least one of the functional components being connected to at least one of the stainless steel pipes of the second pipe joint. The four-way valve assembly further comprises a first branch pipe, the first pipe joint comprises a first stainless steel pipe provided with a first opening, one connection port of the first branch pipe is connected to the first opening, and the other connection port of the first branch pipe is connected to and in communication with one of the functional components.

2. The four-way valve assembly of claim 1, wherein, The functional component connected to and in communication with the first branch pipe is a first pressure sensor, and the first pressure sensor is configured to detect the refrigerant pressure of the first pipe joint.

3. The four-way valve assembly of claim 2, wherein, The first branch pipe is made of stainless steel, the interface between the first branch pipe and the first pressure sensor is provided with a first copper adapter, the first pressure sensor is provided with a first copper connecting pipe, and the first copper connecting pipe is welded to the first copper adapter.

4. The four-way valve assembly of claim 3, wherein, The first pipe joint further comprises a second stainless steel pipe, one end of the second stainless steel pipe is connected to and in communication with the main valve, the other end of the second stainless steel pipe is sleeved with one end of the first stainless steel pipe, and the other end of the first stainless steel pipe is connected to the exhaust port.

5. The four-way valve assembly of any one of claims 2-4, wherein, The four-way valve assembly further comprises a second branch pipe, the second pipe joint comprises a third stainless steel pipe provided with a second opening, one connection port of the second branch pipe is connected to the second opening, and the other connection port of the second branch pipe is connected to and in communication with one of the functional components.

6. The four-way valve assembly of any one of claims 2-5, wherein, The four-way valve assembly further comprises a bypass pipe, the functional component connected to and in communication with the first branch pipe is a first pressure sensor configured to detect the refrigerant pressure of the first pipe joint, and the functional component connected to and in communication with the second branch pipe is a first valve body configured to be in communication with the first branch pipe through the bypass pipe.

7. The four-way valve assembly of claim 6, wherein, The first valve body is configured to be opened when the first pressure sensor detects that the refrigerant pressure of the first pipe joint exceeds a first threshold value, so as to allow the refrigerant in the first pipe joint to flow into the second pipe joint.

8. The four-way valve assembly of claim 7, wherein, The bypass pipe comprises a throttling device.

9. The four-way valve assembly of claim 7, wherein, The throttling device is a throttle valve comprising a main pipe portion and a valve core arranged in the main pipe portion, one port of the main pipe portion is connected to the first branch pipe, the other port of the main pipe portion is connected to the second branch pipe, and the valve core is configured to control the flow rate of the refrigerant flowing through the main pipe portion.

10. The four-way valve assembly of claim 9, wherein, ​ 11. The four-way valve assembly of claim 9, wherein, The throttling device is a capillary assembly, which comprises a capillary part and two connecting sleeves respectively arranged at two ends of the capillary part, the pipe diameter of the connecting sleeves is larger than that of the capillary part, one of the two connecting sleeves is used for connecting the first branch pipe, and the other of the two connecting sleeves is used for connecting the second branch pipe.

12. The four-way valve assembly of claim 11, wherein, The material of the capillary part is copper or copper alloy or stainless steel, the connecting sleeves are made of copper material, the first branch pipe is provided with a second copper adapter, the second branch pipe is provided with a third copper adapter, the second copper adapter is connected with one of the connecting sleeves, and the third copper adapter is connected with the other connecting sleeve.

13. The four-way valve assembly of claim 2, wherein, The four-way valve assembly further comprises a third branch pipe, the first stainless steel pipe is provided with a third opening, one connecting port of the third branch pipe is connected with the third opening, and the other connecting port of the third branch pipe is connected and communicated with a functional component, the functional component connected with the third branch pipe is a second valve body, and the second valve body is used for communicating a defrosting pipe of the heating and ventilation equipment.

14. The four-way valve assembly of claim 13, wherein, The third branch pipe is a copper pipe, and the second valve body is provided with a second copper connecting pipe, and the third branch pipe is welded with the second copper connecting pipe.

15. The four-way valve assembly of any of claims 7-12, wherein, The first branch pipe and the second branch pipe are made of stainless steel material, and / or the bypass pipe is made of stainless steel material or copper material.

16. The four-way valve assembly of any of claims 6-12, wherein, The four-way valve assembly further comprises a fourth branch pipe, the third stainless steel pipe is provided with a fourth opening, one connecting port of the fourth branch pipe is connected with the fourth opening, and the other connecting port of the fourth branch pipe is connected and communicated with a functional component, the functional component connected and communicated with the fourth branch pipe is a second pressure sensor, and the second pressure sensor is used for detecting the refrigerant pressure of the second pipe joint.

17. The four-way valve assembly of any of claims 6-12, wherein, The four-way valve assembly further comprises a fifth branch pipe, the third stainless steel pipe is provided with a fifth opening, one connecting port of the fifth branch pipe is connected with the fifth opening, and the other connecting port of the fifth branch pipe is connected and communicated with a functional component, the functional component connected and communicated with the fifth branch pipe is a third valve body, and the third valve body is used for communicating a refrigerant passage with a pressure greater than that of the second pipe joint in a refrigerant circuit of the heating and ventilation equipment.

18. The four-way valve assembly of any of claims 6-12, wherein, The second pipe joint comprises a fourth stainless steel pipe, one end of the fourth stainless steel pipe is connected and communicated with the main valve, the other end of the fourth stainless steel pipe is sleeved with one end of the third stainless steel pipe, and the other end of the third stainless steel pipe is used for communicating the gas return port.

19. The four-way valve assembly of any one of claims 1-14, wherein, The four-way valve assembly comprises a third pipe joint, the third pipe joint comprises a fifth stainless steel pipe and a sixth stainless steel pipe, one end of the fifth stainless steel pipe is connected and communicated with the main valve, the other end of the fifth stainless steel pipe is sleeved with one end of the sixth stainless steel pipe, and the other end of the sixth stainless steel pipe is used for communicating a heat source heat exchanger of the heating and ventilation equipment.

20. The four-way valve assembly of any one of claims 1-14, wherein, The fourth pipe joint comprises a seventh stainless steel pipe and an eighth stainless steel pipe, one end of the seventh stainless steel pipe is connected with and communicates with the main valve, the other end of the eighth stainless steel pipe is sleeved with one end of the seventh stainless steel pipe, and the other end of the eighth stainless steel pipe is used for communicating with the load heat exchanger of the heating and ventilation equipment.

21. The four-way valve assembly of claim 20, wherein, The eighth stainless steel pipe is provided with a plurality of bending sections, the axis of the main valve, the axis of the seventh stainless steel pipe and the axis of the eighth stainless steel pipe at any position are located in the same plane.

22. The four-way valve assembly of any one of claims 1-14, wherein, The functional component is provided with a connecting pipe, the stainless steel pipe is connected with the connecting pipe through a branch pipe; The material of the connecting pipe and the branch pipe is stainless steel, and the connecting pipe and the branch pipe are directly welded; Alternatively, the material of the connecting pipe is copper, the material of the branch pipe is stainless steel, and the branch pipe is connected with the connecting pipe through a copper adapter.

23. The four-way valve assembly of claim 22, wherein, The branch pipe is connected with the connecting pipe through a copper adapter, the copper adapter is a copper plating layer laid on the end of the branch pipe, or the copper adapter is a copper adapter connected between the branch pipe and the connecting pipe.

24. The four-way valve assembly of any one of claims 1-23, wherein, The plurality of functional components include a one-way valve, one end of the first pipe joint away from the main valve is provided with the one-way valve, the one-way valve is used for communicating with an exhaust pipe, the exhaust pipe is used for communicating with an exhaust port of the compressor, the one-way valve is configured to switch between an open state and a closed state, in the case that the one-way valve is in the open state, the one-way valve is in conduction with the first pipe joint and the exhaust port, and in the case that the one-way valve is in the closed state, the one-way valve cuts off the communication between the first pipe joint and the exhaust port.

25. The four-way valve assembly of claim 24, wherein, The one-way valve comprises a valve pipe and a valve core connected in the valve pipe, one end of the valve pipe is mounted on the first pipe joint, and the valve pipe and the first pipe joint are in an integrated connection structure or an integral forming structure.

26. The four-way valve assembly of claim 1, wherein, The plurality of functional components include a first pressure sensor, the first pressure sensor is mounted on and communicates with the first pipe joint, and the first pressure sensor is used for detecting pressure information in the first pipe joint.

27. The four-way valve assembly of claim 26, wherein, The functional component further includes a second pressure sensor, the second pipe joint is used for communicating with an air inlet pipe, the air inlet pipe is used for communicating with a return air port of the compressor, the second pressure sensor is mounted on and communicates with the second pipe joint, and the second pressure sensor is used for detecting pressure information in the second pipe joint.

28. The four-way valve assembly of claim 27, wherein, The first pressure sensor is integrally connected with the first pipe joint; and / or, the second pressure sensor is integrally connected with the second pipe joint.

29. The four-way valve assembly of claim 28, wherein, The first pressure sensor is further connected with and communicates with the second pipe joint, and the first pressure sensor is configured to detect pressure information of the first pipe joint and pressure information of the second pipe joint.

30. The four-way valve assembly of claim 29, wherein, The first pressure sensor comprises a pressure detection mechanism, a first conducting member and a second conducting member. One end of the first conducting member is connected to and communicates with the pressure detection mechanism, and the other end of the first conducting member is connected to and communicates with the first pipe joint. One end of the second conducting member is connected to and communicates with the pressure detection mechanism, and the other end of the second conducting member is connected to and communicates with the second pipe joint. The pressure detection mechanism is configured to detect pressure information in the first pipe joint through the first conducting member and detect pressure information in the second pipe joint through the second conducting member.

31. The four-way valve assembly of claim 30, wherein, The first conducting member is integrally connected to the first pipe joint; and / or the second conducting member is integrally connected to the second pipe joint.

32. The four-way valve assembly of claim 31, wherein, The second conducting member is provided with a bending portion, which is arranged to face the main valve, the first pipe joint and the second pipe joint and enclose the main valve, the first pipe joint and the second pipe joint to form an installation space.

33. The four-way valve assembly of claim 32, wherein, The four-way valve assembly further comprises a pilot valve, which is installed in the main valve and partially located in the installation space.

34. The four-way valve assembly of claim 27, wherein, The first pipe joint is provided with a first connecting interface, and the first pressure sensor is at least partially installed in the first connecting interface and communicates with the first pipe joint through the first connecting interface. The second pipe joint is provided with a second connecting interface, and the second pressure sensor is at least partially installed in the second connecting interface and communicates with the second pipe joint through the second connecting interface.

35. The four-way valve assembly of any one of claims 1-34, wherein, The four-way valve assembly further comprises a second filter, and the four-way valve body further comprises a third pipe joint arranged on the main valve, which is used to communicate a first refrigerant flow path. The first refrigerant flow path is used to communicate a heat exchanger of the heating and ventilation equipment. The second filter is connected to the third pipe joint and is used to filter refrigerant flowing through the third pipe joint.

36. The four-way valve assembly of claim 35, wherein, The third pipe joint is provided with an air outlet, and the second filter comprises a filter cartridge and a first filter member located in the filter cartridge. One end of the filter cartridge is installed in the air outlet and communicates with the third pipe joint through the air outlet.

37. The four-way valve assembly of claim 36, wherein, In a direction away from the third pipe joint, the filter cartridge comprises a first variable diameter section and a diameter expansion section which communicate in sequence. The first variable diameter section is connected to the third pipe joint. The inner diameter of the first variable diameter section gradually increases from one end close to the third pipe joint to the other end away from the third pipe joint. The inner diameter of the diameter expansion section is greater than that of the third pipe joint.

38. The four-way valve assembly of claim 36, wherein, The second filter comprises a second filter member, which is installed in the third pipe joint.

39. The four-way valve assembly of any one of claims 1-34, wherein, The plurality of functional components comprises a first pressure switch, which is installed in the first pipe joint and communicates with the first pipe joint. The plurality of functional components comprises a second pressure switch, which is installed in the second pipe joint and communicates with the second pipe joint.

40. The four-way valve assembly of claim 39, wherein, The first pipe joint is provided with a third connecting interface, and the first pressure switch is mounted on the third connecting interface and communicates with the first pipe joint through the third connecting interface. And / or, the first pipe joint is provided with a fourth connecting interface, and the second pressure switch is mounted on the fourth connecting interface and communicates with the first pipe joint through the fourth connecting interface.

41. The four-way valve assembly of any one of claims 1-34, wherein, The functional component includes a first temperature sensor, which is mounted on the first pipe joint and used for detecting the temperature in the first pipe joint. And / or, the four-way valve assembly further includes a second temperature sensor, which is mounted on the second pipe joint and used for detecting the temperature in the second pipe joint.

42. The four-way valve assembly of claim 41, wherein, The first pipe joint is provided with a fifth connecting interface, and the first temperature sensor is mounted on the fifth connecting interface and communicates with the first pipe joint through the fifth connecting interface. And / or, the first pipe joint is provided with a sixth connecting interface, and the second temperature sensor is mounted on the sixth connecting interface and communicates with the first pipe joint through the sixth connecting interface.

43. The four-way valve assembly of claim 42, wherein, The first temperature sensor includes a first heat-conducting member and a first temperature detecting member, the first heat-conducting member is mounted on the first pipe joint and is in heat-conducting connection with the first pipe joint, the first heat-conducting member is provided with a first accommodating cavity, and the first temperature detecting member is mounted in the first accommodating cavity and is in close contact with the inner wall of the first heat-conducting member.

44. The four-way valve assembly of claim 43, wherein, One end of the first heat-conducting member is provided with a first opening, the first opening communicates with the first accommodating cavity, and the first temperature detecting member is inserted into the first accommodating cavity through the first opening.

45. The four-way valve assembly of any one of claims 1-44, wherein, The four-way valve assembly further includes an adapter, which is mounted on the main valve and used for electrically connecting the functional component and the main control board of the heating and ventilation equipment.

46. The four-way valve assembly of claim 45, wherein, The adapter includes a mounting seat and a central plate, the mounting seat is mounted on the main valve, the mounting seat is provided with an accommodating groove, the central plate is mounted in the mounting seat, and the central plate is used for connecting the main control board and the functional component.

47. The four-way valve assembly of claim 46, wherein, The adapter further includes a cover, which is mounted on the mounting seat and surrounds the accommodating groove to form a cavity for mounting the central plate.

48. A heating and ventilating apparatus outdoor unit, wherein, The heating and ventilation equipment includes a shell, a heat exchanger, a compressor and the four-way valve assembly according to any one of claims 1-47, the heat exchanger, the compressor and the four-way valve assembly are arranged in the shell, the main valve of the four-way valve assembly communicates between the compressor and the heat exchanger, the first pipe joint of the four-way valve assembly communicates with the exhaust port of the compressor, and the second pipe joint of the four-way valve assembly communicates with the gas return port of the compressor.

49. A heating and ventilating apparatus wherein, The heating and ventilation equipment includes an indoor unit and an outdoor unit according to claim 48, and the indoor unit and the outdoor unit are connected through pipelines.

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